Malicious PDF — malware analysis report

Static analysis result for SHA-256 438e018442a2b9a0…

MALICIOUS

PDF

85.4 KB Created: 2021-09-18 13:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c003bb53049dfc0e940c0fa84ed3eceb SHA-1: a77d9fa52188038a735c65ac2a73ee30c4ba1e24 SHA-256: 438e018442a2b9a00c9dfc8ad16bb74060303b8af1b27785907f4adca7be588d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are structured as link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, specifically a phishing or malware distribution scheme. The ML classifier and ClamAV detection further support the malicious classification. While no scripts were directly extracted, the structure and URL patterns suggest the PDF is designed to redirect users to external sites for further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://sbriz.ru/userfiles/file/lexemonigaranovatobasuro.pdf
    • http://aeusjtu.pretty-match.com/upload/files/79316834136.pdf
    • http://consulcongress.it/uploads/assets/file/25478106304.pdf
    • https://www.channeloflove.com/ckfinder/userfiles/files/40522562440.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16138bef7e1c36---25972746555.pdf
    • http://escrima-rlp.de/userfiles/file/kitafufewaz.pdf
    • https://carcable-bg.com/uploads/pictures/files/42799742242.pdf
    • https://grupa-energia.pl/attachments/file/12808882971.pdf
    • http://salamino.pl/userfiles/file/pikelusadijis.pdf
    • https://cicadit.ro/UserFiles/file/1071670904.pdf
    • http://leicesterbiketec.com/userfiles/file/nefigomotetiv.pdf
    • http://smolninskayahotel.com/userfiles/file/46204259397.pdf
    • http://studioesflores.pl/obrazy/file/witijokidetudapaxuxuzel.pdf
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/87031164890.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/s8o6mqi15lmc2a9lttbovtaho4/batuwabaditi.pdf
    • https://bwawarszawa.pl/upload/file/2524127510.pdf
    • http://lixupeng.com/uploads/files/pewaliledemeditep.pdf
    • http://2safe4u.cz/UserFiles/File/rudumagipejepugusopu.pdf
    • https://sahyadrisevasanstha.in/userfiles/file/neritovukotawefipuroja.pdf
    • https://fuze-pay.com/ckfinder/userfiles/files/fubezewetepiwiti.pdf
    • http://mientaytourist.com/uploads/files/mukegon.pdf
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/kufexazofejameloxijufovu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=gta+5+game+free+download+android+mobile
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e809.bin
df6308709aace5b59406edc0e7e1f9efcb8f5bcb368c46922567a5e67071b3a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE809 10928 bytes
font_01_sfnt_off00010134.bin
abf29ecdd96da8ea202bfde9d90b285371df5c3c413e0ddd6e227e9885ebc413		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10134 17836 bytes
font_02_sfnt_off00012f81.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F81 16792 bytes

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